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1
Test Run Procedure
If there are duplicated system addresses, or if the settings for the Nos. of the indoor units are not consistent, an alarm will
occur and the system will not start.
Switch the power supply ON both indoor and outdoor unit.
Short-circuit CHK pin on the outdoor main PCB.
Do not remove CHK pin until test run is completed.
Removing CHK pin stops test run.
Short-circuit RUN pin on the outdoor main PCB for
one second or longer.
Factory setting is cooling operation mode and
cooling operation test run starts.
If heating operation starts, short-circuit both right
side and centre of the MODE pin (centre and COOL)
continuously.
Ensure to conduct a test run. In addition, be sure
to run the cooling operation test run for at least 20
minutes before starting the heating operation test
run.
To conduct heating operation test run, short-circuit
left side and centre of the MODE pin (centre and
HEAT) continuously.
Removing CHK pin’s and MODE pin's short-circuit
stops test run.
For the test run using remote control unit, please
see installation manual included with the remote
control unit.
Check Before Test Run
Content check
Power supply cable
Indoor/outdoor
connection wire
Earth wire
Is the wire set up and connected as described in the instructions? Check for any phase sequence.
Are the wire connection’s screws loose?
Is the open and close device / leakage breaker installed?
Is the power supply cable’s thickness and length appropriately measured as described in the instructions?
Is it earthed (grounded)?
Check that the insulation resistant value is more than 1 MΩ.
Use the 500 V mega-testers to measure the insulation.
Do not use the mega-tester for any other circuit except for voltage of 220-240V or 380-415V.
Are the wire connections for the indoor/outdoor units connected as described in the instructions? Are there
any looped wires?
Was the “N-phase” surely connected when connecting the power supply wire on the three-phase model?
If N-phase is not connected, only the fan may repeat turning ON/OFF without the compressor operating.
In that case, check if there is any problem with N-phase connection.
Refrigerant pipe
Is the piping installed as described in the instructions?
Are the pipes sizes appropriate?
Does the pipe’s length adhere to the specifi cations?
Is the branch pipe slant being appropriately done as described in the instructions?
Was vacuum removal suffi ciently carried out?
Was the leak tightness test carried out with nitrogen gas? Use the testing pressure of 4.15 MPa.
Is the piping insulation material appropriately installed? (Insulation material is necessary for both gas and
liquid piping.)
Is the 3-way valve for the liquid side and gas side open?
Always be sure to use a properly insulated tool to operate the short-circuit pin on the circuit board. (Do not use your fi nger.)
Never switch the power supply ON until the installation has completed.
Supply electrical current through all indoor units and check the voltage.
Supply electrical current through all the outdoor units and check each inter-phase voltage.
Before the test run, ensure to check that the 3-way valve is open. Operating while the valve is closed causes the compressor
to fail.
1-15. PRECAUTIONS REGARDING TEST RUN
RUN pin
MODE pin
*MODE pin: factory setting is cooling
operation mode.
Outdoor main PCB
CHK pin
1-16. CHECKS AFTER INSTALLATION HAVE COMPLETED
Check the following items after completing installation.
Is there a short circuit with the intake air fl ow?
Is the insulation secure? (Refrigerant piping)
Are there any errors with the wiring?
Are the terminal screws loose? Tightening torque (Unit: N•m {k
g
f•m})
M4… 1.57-1.96 {0.16-0.2}, M5... 1.96-2.45 {0.2-0.25}.
Is the drain water fl owing smoothly?
Is the insulation material properly installed?
Is the earth wire securely connected?
Is the front panel and the indoor unit air conditioner fi rmly fi xed and was the installation completed without any
leakage from the refrigerant?
Are the indoor and outdoor units secured fi rmly installed with bolts at secured locations?
User inspection places
Serviceman inspection
places
• Filter and grill cleaning
• Exterior cleaning
• Check the operating status
• Clean the drain pan or things related to the water discharge
• Heat exchanger cleaning
1-17. REGARDING DELIVERY TO THE CUSTOMER
Request the customer to review the instruction manual and explain the operating method for the product.
In addition, it is also recommended that regular inspection checks are agreed upon for maintenance.
Refer to the installation instruction manual provided with the indoor unit for the specifi cations on
the indoor unit installation.
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